diff --git a/channels/fast-4.3.yaml b/channels/fast-4.3.yaml
index 6f04b8cc4..77c40d05a 100644
--- a/channels/fast-4.3.yaml
+++ b/channels/fast-4.3.yaml
@@ -1,4 +1,5 @@
 name: fast-4.3
 versions:
-- 4.2.16
+# until s390 is released on 4.3 we may not want to include it in 4.3 channels
+- 4.2.16+amd64
 - 4.3.0
diff --git a/channels/stable-4.3.yaml b/channels/stable-4.3.yaml
index 32007dc7e..cd41ce1da 100644
--- a/channels/stable-4.3.yaml
+++ b/channels/stable-4.3.yaml
@@ -1,3 +1,4 @@
 name: stable-4.3
 versions:
+# until s390 is released on 4.3 we may not want to include it in 4.3 channels
 - 4.3.0